Milling-machine.



A. T. SINK & G. A. DUDLEY.

l MILLING MACHINE. APPLICATION FILED MAY2o.1914. 1,137,917. Patented May 4, 1915.

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A. T. SINK & 'b'. A. DUDLEY. MILLING MACHINE. APPLlcATIoN mso MAY 2o. 1914.

Patented May 4, 1915.

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I" A '-B' f is supported by integral brackets ARVEL T. SINK, OF DETROIT, MICHIGAN, AND GERGE A. DUDLEY, F BUFFALO, NEW

" YORK.

MILLING-CHINE.

T0 all whom t may concern:

Be it known that we, ARVEL T. SINK and GEORGE A. DUDLEY, citizens of the United States, residin at Detroit, county of Wayne, State of Michigan, and Buffalo, county of Erie, State of New York, respectively, have invented a certain new and useful improvement in Milling-Machines, and declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this speci cation.

This invention relates to milling machines and more especially to milling machines for turning crank pins.

In the drawings,-Figure 1, is an end view of the machine with a part of one gearhousing broken away. Fig. 2, is a longitudinal vertical section taken on the line A-A of Fig. 1. Fig. 3, is a top or plan view of the main part of the machine. Fig. 4, is a front elevation, a part of one gear-housing being broken away.

The bed a of the machine is a casting supported at the ends by uprights b. The` back of the machine is inelosed by the web o which connects the uprights b, b and also forms a support for the bed a. The uprights and web c rest' upon the base d. At the front of the machine is a vertically movable frame e. This frame e is provided with a pair of internally threaded legs f. The rotatable screwthreaded posts g engage with the threads of these legs. These screwthreaded posts are rotated at a low speed by reason of the helical gears h engaging with the worm gears z' upon the countershaft j. This countershaft j is connectible with `the pulley wheel 7c by the shiftable clutch head Z operable by the lever m. This clutch head Z may also be shifted to connect with the pulley wheel n. These pulley wheels run in opposite directions by reason of one of the belts being crossed between the pulley wheel and the power shaft o. This power shaft o protruding outwardly from theweb c. t the left hand end of the ower shaft are severa-l pulleys g whereby diderent speeds and disconnection of the power can be effected. lintermediate the two ends of the ower shaft o are a plurality of pulley'whee s r which are used to drive the operating tools of the ma- Specication of Letters Patent.

Patented May 4, 1915.

chine. These tools are spiral end mills s, that 1s, cutters in the form of cylinders with spirally arranged cutting edges on the periphery and cutting edges on the ends. The shank t of the tool is provided with a pair of collars u. An externally threaded sleeve o surrounds the shank between the two collars u, u. This sleeve o is mounted in a pair of tubular bearings lw, w between which is a spanner nut a'. The screw y protruding into the longitudinal groove e of the sleeve o constrains the sleeve and the tool to move longitudinally when thei spanner Vnut is turned. This arrangement allows a micrometer adjustment of the tool with respect to the work.

As already explained, the rotative mov'ement of the shank t is derived from the pulley wheels r. The small pulleys Z on the ends of the shank are connected by the belts 2 with thesev pulley wheels r. Inasmuch as the pulleys r are fairly large and the pulleys Z are small, the end mills are revolved very rapidly. Examining the power connections between the power shaft and the rotatable threaded posts g, it will be seen that the power is considerably reduced. Hence the frame e does not move vertically very rapidly.-

The frame e slides vertically on the tracks 3 upon the front and sides of the uprights b. The frame e carries a pair of gear-housings 4f.' On the 4posts 5- at the ends of the frame are journaled, one at each end, the pulley wheels 6.v Each of these carries a smaller beveled gear 7 with which the beveled pinion on the end of the shaft 8 meshes. A. worm 9 on the opposite end of the shaft 8 meshes with the helical gear 10 which is connected by a short shaft with the head-stock 11. Belts 12 connect the pulley wheels 6 with the power shaft o. It will be noticed by following these power connections through that there is a considerable reduction in the speed of rotation 'from the power shaft to the head-stock. Work clamps 14 are located on the face of the head-stocks l1 .and these clamp the ends of the work-the pluralthrow crank shaft 15.

The two tools shown in the drawings are each mounted upon a carriage 16. This carriage 16- may be adjusted longitudinally of the bed by loosening the nuts 17 which' engage with screws, whose heads are held in the longitudinal `grooves 18, that have constricted openings. The tools may be easily moved toward or from the work by reason of the carriages 16 being mounted upon the upper or movable bed 19. This upper or movable bed can slide crosswise of the stationary bed a. The stationary bed a is provided with tracks in the form of tenons 20 of a dove-tail. The upper or movable bed is provided with half a dove-tail recess for each recess is formed by the longitudinally movable blocks 21 which are moved into orout of engagement with the tenons or tracks 20 bv the right and left screw-threaded rod 22 -which may be rotated by the crank handle 23. These blocks may bebrought into such lirm engagement with the tenons 'as to practically lock the upper bed in an lpositionor' adjustment with the lower ed a. The movement of the upper bed 19 is eected by turning the crank handle 24 that connects with the rod 25. This rod 25 is journaled in a pair of depending lugs 26 which are integral with the stationary bed a. The pinion v27 on the end of the rod 25 meshes with the idler pinion 28 which in turn meshes with the rack 29 on the bottom of the upperxbed 19. The idler serves to make the bed move the way the crank turns.

The operation of the machine is as follows: The work l5 isinserted between the clamps 14 of the head-stocks 11. These clamps 14 are set eccentrically upon the head-stock so as to bring two pins of the crank shaft to a position of centricity with respect to the head-stocks. The pins undergoing the machining are therefore merely rotated 'upon their own axes to successively present new portions to the cutting edge of the end mills s. In the meantime, the frame e moves upward to bring the pins undergoing machining across the end mill so as to lbite .into the work. The movement of the table may be reversed by throwing the clutch lever m into the other clutch part.

As already\ explained, by turning the Spanner nuts the position of the end mills with r`espect to the carriages 16 may be minutely changed. This will allow the careful adjustment of each end mill with respect to each crank pin after the movable bed has been adjusted. An arm 81 and a screw 30l engaging with the rear of the stationary bed a limit the amount of approach of themill ends to the work that is possible.

What we claim is: A

1. In a milling machine, the combination of an end mill, means for holding a crank y shaft eccentrically of `one of the crank pins,

means for revolving the said crank shaft so as to rotate the said crank pin upon its axis,

and means for moving the crank shaft across the end mill in al direction crosswise of the axis of rotation.

2. In a milling machine, the combination tenon. The other half of the dove-tail cross t eend mill crosswise ofA the axis of rotation. v

3. In a milling machine,'thecombination of an end mill, means for holding and rotatv ing the work adjacent the end mill, means for causing the work to move across the end mill perpendicular to the axis of rotation, a

movable bed, atstationary bed, means for adjusting the movable bed along the stationary bed, and a carrier for said end mill adjustable longitudinally of the movable bed and per endicular to the direction of t e movable bed.

4. In a milling machine, the combination of an'end mill, meansfor holding and 'rotating -the work continuously -and-automatically, a bed upon which the end mill is mounted, a frame upon which the means for holding and rotating the work is mounted, the Said' frame being slidable vertically lwith respect to said bed, and automatic means for slowly sliding said frame vertically to carry theurotating work across the end of the end m1 5. In a milling machine, the combination of a rotatable end mill, a head stock for holding and rotating the work, flexible driving connection for said headstock, a bed upon which said end` mill is mounted, a frame having a sliding connection with the bed and upon which the head stock is mounted, said frame provided with a leg that is threaded, a screw in the form of a rotatable post engaging with said leg, a helical gear on said screw, and a worm for v'driving said helical gear.

.travel of the movable bed is across the stationary bed and at right angles to the adof movability justable path of the carrier upon the movable bed. v

7. In a millingmachine, the combination of a rotatable end mill, a carriage therefor, a movable bed, means for adjusting the car-l riage longitudinally of the movable bed, a stationary bed provided with a tenon-like track running crosswise the' movable bed, the' said movable bed being provided with a half area-eis gs,

dove-tailed recess,a block and a screw for forcing the block against one side of the tenori-like track to complete the dove-tailed recess.

8. ln a milling machine, the combination of a pair of rotatable end mills, separate carriages for each end mill, a movable bed across which said carriages are adjustable longitudinally parallel with the work, automatic means for holding and continuously rotating the work, a stationary bed, means for adjusting the movable bed crossWise of the stationary bed and toward or from the work, a frame verically movable with re.- spe'ct to the movable bed and upon which is mounted the automatic means for Holding and rotating the work, means for slowly moving said frame upward and downward, and means by which the power may be reversed to determine the direction of the vertical movement of the frame.

9. In a milling machine, an end mill, a pair of tubular bearings through which said end mill passes a nut between the tubular bearings, the said end mill being provided with a shank having a pair of collars, one on the outside of eachA tubulary bearing, a

threaded sleeve between said collars and passing through said tubular bearings andv the nut, the said threaded sleeve being provided with a longitudinal groove, and a screw or projection passing through one of the tubular bearings into the said longitudinal groove.

10. ln a milling machine, the combination of a rotatable end mill, a Carriage for said end mill, a movable bed upon which said carriage is adjustable parallel with the work, a stationary bed upon which said movable bed may be adjusted toward or from the worki and an arm passing from said movable bed tothe rear and provided with an adjustable set screw to limit the approach of the end mill to the work.

ln testimony whereof, we sign this specication in the presence of two witnesses.

ARVEL T. SINK. GEORGE A. DUDLEY. Witnesses for Arvel T. Sink:

JOHN T. FAXON, SAMUEL W. FISH. Witnesses for George A. Dudley: CHARLES C. FARNHAM, WILLIAM M. FARNEAM. 

